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Product short description:
  • Active-Low Inputs, Sinking Outputs (Low-Side Switching)
  • 12 input and/or 12 output channels
  • 0 to 35V DC I/O range
  • 10 to 36V DC, 24V AC power
  • Modbus-RTU high-speed RS-485
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These modules provide twelve discrete input and/or output channels. Isolation separates the I/O, power, and network circuits. Network communication adheres to the industry-standard RS-485 Modbus-RTU protocol. Both AC and DC power sources are supported with wide range, non-polarized, diode-coupled terminals.

The open-drain outputs are intended for current-sinking or low-side switching applications. The buffered inputs are active-low. These models are the complement of the 904, 905, and 906 units which have open-source, high-side output switches and active-high inputs. Socketed pull-up resistors are easily removed or exchanged to satisfy your application requirements.

The 903MB model has twelve input/output points that may be used as inputs or outputs on a bit-by-bit basis. Outputs may be read back to verify output settings.

Combining flexible I/O types, wide I/O ranges, and a network interface in a single package, makes this instrument extremely powerful. Multi-channel design adds cost-efficiency and allows high-density mounting. Plus, safe, rugged construction makes these modules reliable for use in both control room and distributed field I/O applications. Custom module configurations are also possible (consult factory for details).

Active-Low Inputs Sinking Outputs (Low-Side Switching)

Models:
901MB: 12 input channels
902MB: 12 output channels
903MB: 12 input/output channels
Input:
Twelve input channels (901, 903 models only)
0 to 35V DC
Output:
Twelve output channels (902, 903 models only)
O to 35V DC
Network Communication: Modbus-RTU high-speed RS-485
Power Requirement: 10 to 36V DC, 24V AC
Approvals:
CE marked. UL, cUL listed
Class I; Division 2; Groups A, B, C, D

Performance Specifications

Discrete Inputs (901 & 903 models only)

Input Type:
12 active-low, buffered inputs, with a common connection.
Inputs include transient suppression devices and series connected 100K ohm resistors, plus diode over-voltage clamps to the internal +5V supply.
Input Signal Voltage Range: 0 to 35V DC, maximum
Input Current: 293μA, typical at 35V DC
Input Signal Threshold:
TTL compatible with 100mV of hysteresis, typical
Low-to-High threshold is 1.7VDC
High-to-Low is 1.6VDC, typical
Limited to TTL levels of 0.8VDC (max. LOW level) and 2.0VDC (min. HIGH level)
Input Resistance: 100K ohms, typical
Input Hysteresis: 100mV DC, typical

Discrete Outputs (902 & 903 models only)

Output Type: 12 independent, open-drain, DMOS MOSFET switches with a common source connection that operate as low-side switches.
Output Voltage Range:
0 to 35V DC max. (0 to 500mA/channel continuous)
External voltage source required
Output ON Resistance: 0.28 ohms maximum
Output Response Time:
Force Single Coil: Output updates within 250μs of receipt of a command.
Force Multiple Coils: First coil updates in 250μs, followed successively by additional coils every 180μs

General

I/O Pull-ups and Socket: 5.6K ohm pull-up resistor SIPs are installed in sockets at each port (four-channels per port).
Excitation (per port): External excitation voltage for each four-channel port is limited to 35V or less.
Supported Modbus Commands: The command/response protocol for communicating with this module adheres to the Modbus/RTU standard for the following Modbus Functions:

  • Read Coil (Output) Status
  • Read Input Status
  • Read Holding Registers
  • Force Single Coil (Output)
  • Preset Single Register
  • Reset Slave
  • Force Multiple Coils (Outputs)
  • Preset Multiple Registers
  • Report Slave ID

LED Indicators: LEDs indicate power, status, and discrete level.
Power Requirements:
10 to 36V DC
22 to 26V AC

Supply Current:
Supply         Current Draw
10V DC    130mA maximum
24V DC      54mA maximum
24V AC      95mA maximum

Isolation:
1500V AC for 60 seconds or 250V AC continuous
3-way isolation between I/O, network, and power circuits

  • Standard Modbus RTU protocol with high-speed RS-485 communication (up to 115K bps)
  • Twelve I/O channels in a single inch-wide unit reduces system costs and saves panel space
  • High-voltage, high-current, open-drain outputs enable direct (low-side) control of external devices
  • High-voltage buffered inputs monitor discrete levels from a variety of industrial devices
  • Tandem input/output circuitry (903 models only) connects input buffers with open-drain outputs for convenient loop-back monitoring of the output state
  • Outputs have built-in over-temperature and over-current shut-down protection, plus active clamping circuits for switching inductive loads
  • Watchdog timers provide a configurable fail-safe output state for use when host I/O communication is lost
  • Three-way isolation eliminates potential ground loops between power, I/O, and network circuitry
  • Self-diagnostics monitor micro controller activity to detect operational failures (lock-up) and execute a reset to restore communication
  • Operating temperature: -25°C to 70°C (-13°F to 158°F)
BusWorks 900MB Modbus RTU Configuration Software (Log in to download the file)
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Additional information

Weight N/A
Dimensions 12 × 13 × 3 in
Part Number

4001-096: USB Ethernet Adapter

  • Description

    Standards

    USB 1.0, 1.1, 2.0 IEEE 802.3, IEEE 802.3u

    Ports One Type-A Male Connector, One RJ-45 Port
    LEDs Link/Activity

    Cabling
    Type Cat 5 Ethernet Cable

    Dimensions
    7.96” x 1.00” x 0.69” (202.3 x 25.35 x 17.65 mm)

    Weight
    0.8 oz (23 kg)

    Power
    3.3V low power consumption

    Certification
    FCC Class B, CE Class B, UL

    Operating Temp.
    32 to 158°F (0 to 70°C)

    Storage Temp.
    32 to 158°F (0 to 70°C)

    Operating Humidity
    10 to 90% non-condensing

    Storage Humidity
    10 to 90% non-condensing

    Includes: Package Contents

    • One USB Ethernet Adapter
    • One Driver Installation CD
    • One Quick Installation Guide
    • One User Guide included on Installation CD
    • One Acromag Ethernet I/O Instruction Sheet
    • One IP Address Batch Configuration CD
  • Features & Benefits

    • Standard Modbus RTU protocol with high-speed RS-485 communication (up to 115K bps)
    • Twelve I/O channels in a single inch-wide unit reduces system costs and saves panel space
    • High-voltage, high-current, open-drain outputs enable direct (low-side) control of external devices
    • High-voltage buffered inputs monitor discrete levels from a variety of industrial devices
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    • Self-diagnostics monitor micro controller activity to detect operational failures (lock-up) and execute a reset to restore communication
    • Operating temperature: -25°C to 70°C (-13°F to 158°F)
  • Specs & Data Sheets

  • Software

    BusWorks 900MB Modbus RTU Configuration Software (Log in to download the file)
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  • Additional information

    Additional information

    Weight N/A
    Dimensions 12 × 13 × 3 in
    Part Number

    4001-096: USB Ethernet Adapter